forked from chartjs/Chart.js
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Chart.js
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Chart.js
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/*!
* Chart.js
* http://chartjs.org/
*
* Copyright 2013 Nick Downie
* Released under the MIT license
* https://github.com/nnnick/Chart.js/blob/master/LICENSE.md
*/
//Define the global Chart Variable as a class.
var Chart = function(context){
var chart = this;
//Easing functions adapted from Robert Penner's easing equations
//http://www.robertpenner.com/easing/
var animationOptions = {
linear : function (t){
return t;
},
easeInQuad: function (t) {
return t*t;
},
easeOutQuad: function (t) {
return -1 *t*(t-2);
},
easeInOutQuad: function (t) {
if ((t/=1/2) < 1) return 1/2*t*t;
return -1/2 * ((--t)*(t-2) - 1);
},
easeInCubic: function (t) {
return t*t*t;
},
easeOutCubic: function (t) {
return 1*((t=t/1-1)*t*t + 1);
},
easeInOutCubic: function (t) {
if ((t/=1/2) < 1) return 1/2*t*t*t;
return 1/2*((t-=2)*t*t + 2);
},
easeInQuart: function (t) {
return t*t*t*t;
},
easeOutQuart: function (t) {
return -1 * ((t=t/1-1)*t*t*t - 1);
},
easeInOutQuart: function (t) {
if ((t/=1/2) < 1) return 1/2*t*t*t*t;
return -1/2 * ((t-=2)*t*t*t - 2);
},
easeInQuint: function (t) {
return 1*(t/=1)*t*t*t*t;
},
easeOutQuint: function (t) {
return 1*((t=t/1-1)*t*t*t*t + 1);
},
easeInOutQuint: function (t) {
if ((t/=1/2) < 1) return 1/2*t*t*t*t*t;
return 1/2*((t-=2)*t*t*t*t + 2);
},
easeInSine: function (t) {
return -1 * Math.cos(t/1 * (Math.PI/2)) + 1;
},
easeOutSine: function (t) {
return 1 * Math.sin(t/1 * (Math.PI/2));
},
easeInOutSine: function (t) {
return -1/2 * (Math.cos(Math.PI*t/1) - 1);
},
easeInExpo: function (t) {
return (t==0) ? 1 : 1 * Math.pow(2, 10 * (t/1 - 1));
},
easeOutExpo: function (t) {
return (t==1) ? 1 : 1 * (-Math.pow(2, -10 * t/1) + 1);
},
easeInOutExpo: function (t) {
if (t==0) return 0;
if (t==1) return 1;
if ((t/=1/2) < 1) return 1/2 * Math.pow(2, 10 * (t - 1));
return 1/2 * (-Math.pow(2, -10 * --t) + 2);
},
easeInCirc: function (t) {
if (t>=1) return t;
return -1 * (Math.sqrt(1 - (t/=1)*t) - 1);
},
easeOutCirc: function (t) {
return 1 * Math.sqrt(1 - (t=t/1-1)*t);
},
easeInOutCirc: function (t) {
if ((t/=1/2) < 1) return -1/2 * (Math.sqrt(1 - t*t) - 1);
return 1/2 * (Math.sqrt(1 - (t-=2)*t) + 1);
},
easeInElastic: function (t) {
var s=1.70158;var p=0;var a=1;
if (t==0) return 0; if ((t/=1)==1) return 1; if (!p) p=1*.3;
if (a < Math.abs(1)) { a=1; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (1/a);
return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*1-s)*(2*Math.PI)/p ));
},
easeOutElastic: function (t) {
var s=1.70158;var p=0;var a=1;
if (t==0) return 0; if ((t/=1)==1) return 1; if (!p) p=1*.3;
if (a < Math.abs(1)) { a=1; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (1/a);
return a*Math.pow(2,-10*t) * Math.sin( (t*1-s)*(2*Math.PI)/p ) + 1;
},
easeInOutElastic: function (t) {
var s=1.70158;var p=0;var a=1;
if (t==0) return 0; if ((t/=1/2)==2) return 1; if (!p) p=1*(.3*1.5);
if (a < Math.abs(1)) { a=1; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (1/a);
if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*1-s)*(2*Math.PI)/p ));
return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*1-s)*(2*Math.PI)/p )*.5 + 1;
},
easeInBack: function (t) {
var s = 1.70158;
return 1*(t/=1)*t*((s+1)*t - s);
},
easeOutBack: function (t) {
var s = 1.70158;
return 1*((t=t/1-1)*t*((s+1)*t + s) + 1);
},
easeInOutBack: function (t) {
var s = 1.70158;
if ((t/=1/2) < 1) return 1/2*(t*t*(((s*=(1.525))+1)*t - s));
return 1/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2);
},
easeInBounce: function (t) {
return 1 - animationOptions.easeOutBounce (1-t);
},
easeOutBounce: function (t) {
if ((t/=1) < (1/2.75)) {
return 1*(7.5625*t*t);
} else if (t < (2/2.75)) {
return 1*(7.5625*(t-=(1.5/2.75))*t + .75);
} else if (t < (2.5/2.75)) {
return 1*(7.5625*(t-=(2.25/2.75))*t + .9375);
} else {
return 1*(7.5625*(t-=(2.625/2.75))*t + .984375);
}
},
easeInOutBounce: function (t) {
if (t < 1/2) return animationOptions.easeInBounce (t*2) * .5;
return animationOptions.easeOutBounce (t*2-1) * .5 + 1*.5;
}
};
//Variables global to the chart
var width = context.canvas.width;
var height = context.canvas.height;
//High pixel density displays - multiply the size of the canvas height/width by the device pixel ratio, then scale.
if (window.devicePixelRatio) {
context.canvas.style.width = width + "px";
context.canvas.style.height = height + "px";
context.canvas.height = height * window.devicePixelRatio;
context.canvas.width = width * window.devicePixelRatio;
context.scale(window.devicePixelRatio, window.devicePixelRatio);
}
this.PolarArea = function(data,options){
chart.PolarArea.defaults = {
scaleOverlay : true,
scaleOverride : false,
scaleSteps : null,
scaleStepWidth : null,
scaleStartValue : null,
scaleShowLine : true,
scaleLineColor : "rgba(0,0,0,.1)",
scaleLineWidth : 1,
scaleShowLabels : true,
scaleLabel : "<%=value%>",
scaleFontFamily : "'Arial'",
scaleFontSize : 12,
scaleFontStyle : "normal",
scaleFontColor : "#666",
scaleShowLabelBackdrop : true,
scaleBackdropColor : "rgba(255,255,255,0.75)",
scaleBackdropPaddingY : 2,
scaleBackdropPaddingX : 2,
segmentShowStroke : true,
segmentStrokeColor : "#fff",
segmentStrokeWidth : 2,
animation : true,
animationSteps : 100,
animationEasing : "easeOutBounce",
animateRotate : true,
animateScale : false,
onAnimationComplete : null
};
var config = (options)? mergeChartConfig(chart.PolarArea.defaults,options) : chart.PolarArea.defaults;
return new PolarArea(data,config,context);
};
this.Radar = function(data,options){
chart.Radar.defaults = {
scaleOverlay : false,
scaleOverride : false,
scaleSteps : null,
scaleStepWidth : null,
scaleStartValue : null,
scaleShowLine : true,
scaleLineColor : "rgba(0,0,0,.1)",
scaleLineWidth : 1,
scaleShowLabels : false,
scaleLabel : "<%=value%>",
scaleFontFamily : "'Arial'",
scaleFontSize : 12,
scaleFontStyle : "normal",
scaleFontColor : "#666",
scaleShowLabelBackdrop : true,
scaleBackdropColor : "rgba(255,255,255,0.75)",
scaleBackdropPaddingY : 2,
scaleBackdropPaddingX : 2,
angleShowLineOut : true,
angleLineColor : "rgba(0,0,0,.1)",
angleLineWidth : 1,
pointLabelFontFamily : "'Arial'",
pointLabelFontStyle : "normal",
pointLabelFontSize : 12,
pointLabelFontColor : "#666",
pointDot : true,
pointDotRadius : 3,
pointDotStrokeWidth : 1,
datasetStroke : true,
datasetStrokeWidth : 2,
datasetFill : true,
animation : true,
animationSteps : 60,
animationEasing : "easeOutQuart",
onAnimationComplete : null
};
var config = (options)? mergeChartConfig(chart.Radar.defaults,options) : chart.Radar.defaults;
return new Radar(data,config,context);
};
this.Pie = function(data,options){
chart.Pie.defaults = {
segmentShowStroke : true,
segmentStrokeColor : "#fff",
segmentStrokeWidth : 2,
animation : true,
animationSteps : 100,
animationEasing : "easeOutBounce",
animateRotate : true,
animateScale : false,
onAnimationComplete : null
};
var config = (options)? mergeChartConfig(chart.Pie.defaults,options) : chart.Pie.defaults;
return new Pie(data,config,context);
};
this.Doughnut = function(data,options){
chart.Doughnut.defaults = {
segmentShowStroke : true,
segmentStrokeColor : "#fff",
segmentStrokeWidth : 2,
percentageInnerCutout : 50,
animation : true,
animationSteps : 100,
animationEasing : "easeOutBounce",
animateRotate : true,
animateScale : false,
onAnimationComplete : null
};
var config = (options)? mergeChartConfig(chart.Doughnut.defaults,options) : chart.Doughnut.defaults;
return new Doughnut(data,config,context);
};
this.Line = function(data,options){
chart.Line.defaults = {
scaleOverlay : false,
scaleOverride : false,
scaleSteps : null,
scaleStepWidth : null,
scaleStartValue : null,
scaleLineColor : "rgba(0,0,0,.1)",
scaleLineWidth : 1,
scaleShowLabels : true,
scaleLabel : "<%=value%>",
scaleFontFamily : "'Arial'",
scaleFontSize : 12,
scaleFontStyle : "normal",
scaleFontColor : "#666",
scaleShowGridLines : true,
scaleGridLineColor : "rgba(0,0,0,.05)",
scaleGridLineWidth : 1,
bezierCurve : true,
pointDot : true,
pointDotRadius : 4,
pointDotStrokeWidth : 2,
datasetStroke : true,
datasetStrokeWidth : 2,
datasetFill : true,
animation : true,
animationSteps : 60,
animationEasing : "easeOutQuart",
onAnimationComplete : null
};
var config = (options) ? mergeChartConfig(chart.Line.defaults,options) : chart.Line.defaults;
return new Line(data,config,context);
}
this.Bar = function(data,options){
chart.Bar.defaults = {
scaleOverlay : false,
scaleOverride : false,
scaleSteps : null,
scaleStepWidth : null,
scaleStartValue : null,
scaleLineColor : "rgba(0,0,0,.1)",
scaleLineWidth : 1,
scaleShowLabels : true,
scaleLabel : "<%=value%>",
scaleFontFamily : "'Arial'",
scaleFontSize : 12,
scaleFontStyle : "normal",
scaleFontColor : "#666",
scaleShowGridLines : true,
scaleGridLineColor : "rgba(0,0,0,.05)",
scaleGridLineWidth : 1,
barShowStroke : true,
barStrokeWidth : 2,
barValueSpacing : 5,
barDatasetSpacing : 1,
animation : true,
animationSteps : 60,
animationEasing : "easeOutQuart",
onAnimationComplete : null
};
var config = (options) ? mergeChartConfig(chart.Bar.defaults,options) : chart.Bar.defaults;
return new Bar(data,config,context);
}
var clear = function(c){
c.clearRect(0, 0, width, height);
};
var PolarArea = function(data,config,ctx){
var maxSize, scaleHop, calculatedScale, labelHeight, scaleHeight, valueBounds, labelTemplateString;
calculateDrawingSizes();
valueBounds = getValueBounds();
labelTemplateString = (config.scaleShowLabels)? config.scaleLabel : null;
//Check and set the scale
if (!config.scaleOverride){
calculatedScale = calculateScale(scaleHeight,valueBounds.maxSteps,valueBounds.minSteps,valueBounds.maxValue,valueBounds.minValue,labelTemplateString);
}
else {
calculatedScale = {
steps : config.scaleSteps,
stepValue : config.scaleStepWidth,
graphMin : config.scaleStartValue,
labels : []
}
for (var i=0; i<calculatedScale.steps; i++){
if(labelTemplateString){
calculatedScale.labels.push(tmpl(labelTemplateString,{value:(config.scaleStartValue + (config.scaleStepWidth * i)).toFixed(getDecimalPlaces (config.scaleStepWidth))}));
}
}
}
scaleHop = maxSize/(calculatedScale.steps);
//Wrap in an animation loop wrapper
animationLoop(config,drawScale,drawAllSegments,ctx);
function calculateDrawingSizes(){
maxSize = (Min([width,height])/2);
//Remove whatever is larger - the font size or line width.
maxSize -= Max([config.scaleFontSize*0.5,config.scaleLineWidth*0.5]);
labelHeight = config.scaleFontSize*2;
//If we're drawing the backdrop - add the Y padding to the label height and remove from drawing region.
if (config.scaleShowLabelBackdrop){
labelHeight += (2 * config.scaleBackdropPaddingY);
maxSize -= config.scaleBackdropPaddingY*1.5;
}
scaleHeight = maxSize;
//If the label height is less than 5, set it to 5 so we don't have lines on top of each other.
labelHeight = Default(labelHeight,5);
}
function drawScale(){
for (var i=0; i<calculatedScale.steps; i++){
//If the line object is there
if (config.scaleShowLine){
ctx.beginPath();
ctx.arc(width/2, height/2, scaleHop * (i + 1), 0, (Math.PI * 2), true);
ctx.strokeStyle = config.scaleLineColor;
ctx.lineWidth = config.scaleLineWidth;
ctx.stroke();
}
if (config.scaleShowLabels){
ctx.textAlign = "center";
ctx.font = config.scaleFontStyle + " " + config.scaleFontSize + "px " + config.scaleFontFamily;
var label = calculatedScale.labels[i];
//If the backdrop object is within the font object
if (config.scaleShowLabelBackdrop){
var textWidth = ctx.measureText(label).width;
ctx.fillStyle = config.scaleBackdropColor;
ctx.beginPath();
ctx.rect(
Math.round(width/2 - textWidth/2 - config.scaleBackdropPaddingX), //X
Math.round(height/2 - (scaleHop * (i + 1)) - config.scaleFontSize*0.5 - config.scaleBackdropPaddingY),//Y
Math.round(textWidth + (config.scaleBackdropPaddingX*2)), //Width
Math.round(config.scaleFontSize + (config.scaleBackdropPaddingY*2)) //Height
);
ctx.fill();
}
ctx.textBaseline = "middle";
ctx.fillStyle = config.scaleFontColor;
ctx.fillText(label,width/2,height/2 - (scaleHop * (i + 1)));
}
}
}
function drawAllSegments(animationDecimal){
var startAngle = -Math.PI/2,
angleStep = (Math.PI*2)/data.length,
scaleAnimation = 1,
rotateAnimation = 1;
if (config.animation) {
if (config.animateScale) {
scaleAnimation = animationDecimal;
}
if (config.animateRotate){
rotateAnimation = animationDecimal;
}
}
for (var i=0; i<data.length; i++){
ctx.beginPath();
ctx.arc(width/2,height/2,scaleAnimation * calculateOffset(data[i].value,calculatedScale,scaleHop),startAngle, startAngle + rotateAnimation*angleStep, false);
ctx.lineTo(width/2,height/2);
ctx.closePath();
ctx.fillStyle = data[i].color;
ctx.fill();
if(config.segmentShowStroke){
ctx.strokeStyle = config.segmentStrokeColor;
ctx.lineWidth = config.segmentStrokeWidth;
ctx.stroke();
}
startAngle += rotateAnimation*angleStep;
}
}
function getValueBounds() {
var upperValue = Number.MIN_VALUE;
var lowerValue = Number.MAX_VALUE;
for (var i=0; i<data.length; i++){
if (data[i].value > upperValue) {upperValue = data[i].value;}
if (data[i].value < lowerValue) {lowerValue = data[i].value;}
};
var maxSteps = Math.floor((scaleHeight / (labelHeight*0.66)));
var minSteps = Math.floor((scaleHeight / labelHeight*0.5));
return {
maxValue : upperValue,
minValue : lowerValue,
maxSteps : maxSteps,
minSteps : minSteps
};
}
}
var Radar = function (data,config,ctx) {
var maxSize, scaleHop, calculatedScale, labelHeight, scaleHeight, valueBounds, labelTemplateString;
//If no labels are defined set to an empty array, so referencing length for looping doesn't blow up.
if (!data.labels) data.labels = [];
calculateDrawingSizes();
var valueBounds = getValueBounds();
labelTemplateString = (config.scaleShowLabels)? config.scaleLabel : null;
//Check and set the scale
if (!config.scaleOverride){
calculatedScale = calculateScale(scaleHeight,valueBounds.maxSteps,valueBounds.minSteps,valueBounds.maxValue,valueBounds.minValue,labelTemplateString);
}
else {
calculatedScale = {
steps : config.scaleSteps,
stepValue : config.scaleStepWidth,
graphMin : config.scaleStartValue,
labels : []
}
for (var i=0; i<calculatedScale.steps; i++){
if(labelTemplateString){
calculatedScale.labels.push(tmpl(labelTemplateString,{value:(config.scaleStartValue + (config.scaleStepWidth * i)).toFixed(getDecimalPlaces (config.scaleStepWidth))}));
}
}
}
scaleHop = maxSize/(calculatedScale.steps);
animationLoop(config,drawScale,drawAllDataPoints,ctx);
//Radar specific functions.
function drawAllDataPoints(animationDecimal){
var rotationDegree = (2*Math.PI)/data.datasets[0].data.length;
ctx.save();
//translate to the centre of the canvas.
ctx.translate(width/2,height/2);
//We accept multiple data sets for radar charts, so show loop through each set
for (var i=0; i<data.datasets.length; i++){
ctx.beginPath();
ctx.moveTo(0,animationDecimal*(-1*calculateOffset(data.datasets[i].data[0],calculatedScale,scaleHop)));
for (var j=1; j<data.datasets[i].data.length; j++){
ctx.rotate(rotationDegree);
ctx.lineTo(0,animationDecimal*(-1*calculateOffset(data.datasets[i].data[j],calculatedScale,scaleHop)));
}
ctx.closePath();
ctx.fillStyle = data.datasets[i].fillColor;
ctx.strokeStyle = data.datasets[i].strokeColor;
ctx.lineWidth = config.datasetStrokeWidth;
ctx.fill();
ctx.stroke();
if (config.pointDot){
ctx.fillStyle = data.datasets[i].pointColor;
ctx.strokeStyle = data.datasets[i].pointStrokeColor;
ctx.lineWidth = config.pointDotStrokeWidth;
for (var k=0; k<data.datasets[i].data.length; k++){
ctx.rotate(rotationDegree);
ctx.beginPath();
ctx.arc(0,animationDecimal*(-1*calculateOffset(data.datasets[i].data[k],calculatedScale,scaleHop)),config.pointDotRadius,2*Math.PI,false);
ctx.fill();
ctx.stroke();
}
}
ctx.rotate(rotationDegree);
}
ctx.restore();
}
function drawScale(){
var rotationDegree = (2*Math.PI)/data.datasets[0].data.length;
ctx.save();
ctx.translate(width / 2, height / 2);
if (config.angleShowLineOut){
ctx.strokeStyle = config.angleLineColor;
ctx.lineWidth = config.angleLineWidth;
for (var h=0; h<data.datasets[0].data.length; h++){
ctx.rotate(rotationDegree);
ctx.beginPath();
ctx.moveTo(0,0);
ctx.lineTo(0,-maxSize);
ctx.stroke();
}
}
for (var i=0; i<calculatedScale.steps; i++){
ctx.beginPath();
if(config.scaleShowLine){
ctx.strokeStyle = config.scaleLineColor;
ctx.lineWidth = config.scaleLineWidth;
ctx.moveTo(0,-scaleHop * (i+1));
for (var j=0; j<data.datasets[0].data.length; j++){
ctx.rotate(rotationDegree);
ctx.lineTo(0,-scaleHop * (i+1));
}
ctx.closePath();
ctx.stroke();
}
if (config.scaleShowLabels){
ctx.textAlign = 'center';
ctx.font = config.scaleFontStyle + " " + config.scaleFontSize+"px " + config.scaleFontFamily;
ctx.textBaseline = "middle";
if (config.scaleShowLabelBackdrop){
var textWidth = ctx.measureText(calculatedScale.labels[i]).width;
ctx.fillStyle = config.scaleBackdropColor;
ctx.beginPath();
ctx.rect(
Math.round(- textWidth/2 - config.scaleBackdropPaddingX), //X
Math.round((-scaleHop * (i + 1)) - config.scaleFontSize*0.5 - config.scaleBackdropPaddingY),//Y
Math.round(textWidth + (config.scaleBackdropPaddingX*2)), //Width
Math.round(config.scaleFontSize + (config.scaleBackdropPaddingY*2)) //Height
);
ctx.fill();
}
ctx.fillStyle = config.scaleFontColor;
ctx.fillText(calculatedScale.labels[i],0,-scaleHop*(i+1));
}
}
for (var k=0; k<data.labels.length; k++){
ctx.font = config.pointLabelFontStyle + " " + config.pointLabelFontSize+"px " + config.pointLabelFontFamily;
ctx.fillStyle = config.pointLabelFontColor;
var opposite = Math.sin(rotationDegree*k) * (maxSize + config.pointLabelFontSize);
var adjacent = Math.cos(rotationDegree*k) * (maxSize + config.pointLabelFontSize);
if(rotationDegree*k == Math.PI || rotationDegree*k == 0){
ctx.textAlign = "center";
}
else if(rotationDegree*k > Math.PI){
ctx.textAlign = "right";
}
else{
ctx.textAlign = "left";
}
ctx.textBaseline = "middle";
ctx.fillText(data.labels[k],opposite,-adjacent);
}
ctx.restore();
};
function calculateDrawingSizes(){
maxSize = (Min([width,height])/2);
labelHeight = config.scaleFontSize*2;
var labelLength = 0;
for (var i=0; i<data.labels.length; i++){
ctx.font = config.pointLabelFontStyle + " " + config.pointLabelFontSize+"px " + config.pointLabelFontFamily;
var textMeasurement = ctx.measureText(data.labels[i]).width;
if(textMeasurement>labelLength) labelLength = textMeasurement;
}
//Figure out whats the largest - the height of the text or the width of what's there, and minus it from the maximum usable size.
maxSize -= Max([labelLength,((config.pointLabelFontSize/2)*1.5)]);
maxSize -= config.pointLabelFontSize;
maxSize = CapValue(maxSize, null, 0);
scaleHeight = maxSize;
//If the label height is less than 5, set it to 5 so we don't have lines on top of each other.
labelHeight = Default(labelHeight,5);
};
function getValueBounds() {
var upperValue = Number.MIN_VALUE;
var lowerValue = Number.MAX_VALUE;
for (var i=0; i<data.datasets.length; i++){
for (var j=0; j<data.datasets[i].data.length; j++){
if (data.datasets[i].data[j] > upperValue){upperValue = data.datasets[i].data[j]}
if (data.datasets[i].data[j] < lowerValue){lowerValue = data.datasets[i].data[j]}
}
}
var maxSteps = Math.floor((scaleHeight / (labelHeight*0.66)));
var minSteps = Math.floor((scaleHeight / labelHeight*0.5));
return {
maxValue : upperValue,
minValue : lowerValue,
maxSteps : maxSteps,
minSteps : minSteps
};
}
}
var Pie = function(data,config,ctx){
var segmentTotal = 0;
//In case we have a canvas that is not a square. Minus 5 pixels as padding round the edge.
var pieRadius = Min([height/2,width/2]) - 5;
for (var i=0; i<data.length; i++){
segmentTotal += data[i].value;
}
animationLoop(config,null,drawPieSegments,ctx);
function drawPieSegments (animationDecimal){
var cumulativeAngle = -Math.PI/2,
scaleAnimation = 1,
rotateAnimation = 1;
if (config.animation) {
if (config.animateScale) {
scaleAnimation = animationDecimal;
}
if (config.animateRotate){
rotateAnimation = animationDecimal;
}
}
for (var i=0; i<data.length; i++){
var segmentAngle = rotateAnimation * ((data[i].value/segmentTotal) * (Math.PI*2));
ctx.beginPath();
ctx.arc(width/2,height/2,scaleAnimation * pieRadius,cumulativeAngle,cumulativeAngle + segmentAngle);
ctx.lineTo(width/2,height/2);
ctx.closePath();
ctx.fillStyle = data[i].color;
ctx.fill();
if(config.segmentShowStroke){
ctx.lineWidth = config.segmentStrokeWidth;
ctx.strokeStyle = config.segmentStrokeColor;
ctx.stroke();
}
cumulativeAngle += segmentAngle;
}
}
}
var Doughnut = function(data,config,ctx){
var segmentTotal = 0;
//In case we have a canvas that is not a square. Minus 5 pixels as padding round the edge.
var doughnutRadius = Min([height/2,width/2]) - 5;
var cutoutRadius = doughnutRadius * (config.percentageInnerCutout/100);
for (var i=0; i<data.length; i++){
segmentTotal += data[i].value;
}
animationLoop(config,null,drawPieSegments,ctx);
function drawPieSegments (animationDecimal){
var cumulativeAngle = -Math.PI/2,
scaleAnimation = 1,
rotateAnimation = 1;
if (config.animation) {
if (config.animateScale) {
scaleAnimation = animationDecimal;
}
if (config.animateRotate){
rotateAnimation = animationDecimal;
}
}
for (var i=0; i<data.length; i++){
var segmentAngle = rotateAnimation * ((data[i].value/segmentTotal) * (Math.PI*2));
ctx.beginPath();
ctx.arc(width/2,height/2,scaleAnimation * doughnutRadius,cumulativeAngle,cumulativeAngle + segmentAngle,false);
ctx.arc(width/2,height/2,scaleAnimation * cutoutRadius,cumulativeAngle + segmentAngle,cumulativeAngle,true);
ctx.closePath();
ctx.fillStyle = data[i].color;
ctx.fill();
if(config.segmentShowStroke){
ctx.lineWidth = config.segmentStrokeWidth;
ctx.strokeStyle = config.segmentStrokeColor;
ctx.stroke();
}
cumulativeAngle += segmentAngle;
}
}
}
var Line = function(data,config,ctx){
var maxSize, scaleHop, calculatedScale, labelHeight, scaleHeight, valueBounds, labelTemplateString, valueHop,widestXLabel, xAxisLength,yAxisPosX,xAxisPosY, rotateLabels = 0;
calculateDrawingSizes();
valueBounds = getValueBounds();
//Check and set the scale
labelTemplateString = (config.scaleShowLabels)? config.scaleLabel : "";
if (!config.scaleOverride){
calculatedScale = calculateScale(scaleHeight,valueBounds.maxSteps,valueBounds.minSteps,valueBounds.maxValue,valueBounds.minValue,labelTemplateString);
}
else {
calculatedScale = {
steps : config.scaleSteps,
stepValue : config.scaleStepWidth,
graphMin : config.scaleStartValue,
labels : []
}
for (var i=0; i<calculatedScale.steps; i++){
if(labelTemplateString){
calculatedScale.labels.push(tmpl(labelTemplateString,{value:(config.scaleStartValue + (config.scaleStepWidth * i)).toFixed(getDecimalPlaces (config.scaleStepWidth))}));
}
}
}
scaleHop = Math.floor(scaleHeight/calculatedScale.steps);
calculateXAxisSize();
animationLoop(config,drawScale,drawLines,ctx);
function drawLines(animPc){
for (var i=0; i<data.datasets.length; i++){
ctx.strokeStyle = data.datasets[i].strokeColor;
ctx.lineWidth = config.datasetStrokeWidth;
ctx.beginPath();
ctx.moveTo(yAxisPosX, xAxisPosY - animPc*(calculateOffset(data.datasets[i].data[0],calculatedScale,scaleHop)))
for (var j=1; j<data.datasets[i].data.length; j++){
if (config.bezierCurve){
ctx.bezierCurveTo(xPos(j-0.5),yPos(i,j-1),xPos(j-0.5),yPos(i,j),xPos(j),yPos(i,j));
}
else{
ctx.lineTo(xPos(j),yPos(i,j));
}
}
ctx.stroke();
if (config.datasetFill){
ctx.lineTo(yAxisPosX + (valueHop*(data.datasets[i].data.length-1)),xAxisPosY);
ctx.lineTo(yAxisPosX,xAxisPosY);
ctx.closePath();
ctx.fillStyle = data.datasets[i].fillColor;
ctx.fill();
}
else{
ctx.closePath();
}
if(config.pointDot){
ctx.fillStyle = data.datasets[i].pointColor;
ctx.strokeStyle = data.datasets[i].pointStrokeColor;
ctx.lineWidth = config.pointDotStrokeWidth;
for (var k=0; k<data.datasets[i].data.length; k++){
ctx.beginPath();
ctx.arc(yAxisPosX + (valueHop *k),xAxisPosY - animPc*(calculateOffset(data.datasets[i].data[k],calculatedScale,scaleHop)),config.pointDotRadius,0,Math.PI*2,true);
ctx.fill();
ctx.stroke();
}
}
}
function yPos(dataSet,iteration){
return xAxisPosY - animPc*(calculateOffset(data.datasets[dataSet].data[iteration],calculatedScale,scaleHop));
}
function xPos(iteration){
return yAxisPosX + (valueHop * iteration);
}
}
function drawScale(){
//X axis line
ctx.lineWidth = config.scaleLineWidth;
ctx.strokeStyle = config.scaleLineColor;
ctx.beginPath();
ctx.moveTo(width-widestXLabel/2+5,xAxisPosY);
ctx.lineTo(width-(widestXLabel/2)-xAxisLength-5,xAxisPosY);
ctx.stroke();
if (rotateLabels > 0){
ctx.save();
ctx.textAlign = "right";
}
else{
ctx.textAlign = "center";
}
ctx.fillStyle = config.scaleFontColor;
for (var i=0; i<data.labels.length; i++){
ctx.save();
if (rotateLabels > 0){
ctx.translate(yAxisPosX + i*valueHop,xAxisPosY + config.scaleFontSize);
ctx.rotate(-(rotateLabels * (Math.PI/180)));
ctx.fillText(data.labels[i], 0,0);
ctx.restore();
}
else{
ctx.fillText(data.labels[i], yAxisPosX + i*valueHop,xAxisPosY + config.scaleFontSize+3);
}
ctx.beginPath();
ctx.moveTo(yAxisPosX + i * valueHop, xAxisPosY+3);
//Check i isnt 0, so we dont go over the Y axis twice.
if(config.scaleShowGridLines && i>0){
ctx.lineWidth = config.scaleGridLineWidth;
ctx.strokeStyle = config.scaleGridLineColor;
ctx.lineTo(yAxisPosX + i * valueHop, 5);
}
else{
ctx.lineTo(yAxisPosX + i * valueHop, xAxisPosY+3);
}
ctx.stroke();
}
//Y axis
ctx.lineWidth = config.scaleLineWidth;
ctx.strokeStyle = config.scaleLineColor;
ctx.beginPath();
ctx.moveTo(yAxisPosX,xAxisPosY+5);
ctx.lineTo(yAxisPosX,5);
ctx.stroke();
ctx.textAlign = "right";
ctx.textBaseline = "middle";
for (var j=0; j<calculatedScale.steps; j++){
ctx.beginPath();
ctx.moveTo(yAxisPosX-3,xAxisPosY - ((j+1) * scaleHop));
if (config.scaleShowGridLines){
ctx.lineWidth = config.scaleGridLineWidth;
ctx.strokeStyle = config.scaleGridLineColor;
ctx.lineTo(yAxisPosX + xAxisLength + 5,xAxisPosY - ((j+1) * scaleHop));
}
else{
ctx.lineTo(yAxisPosX-0.5,xAxisPosY - ((j+1) * scaleHop));
}
ctx.stroke();
if (config.scaleShowLabels){
ctx.fillText(calculatedScale.labels[j],yAxisPosX-8,xAxisPosY - ((j+1) * scaleHop));
}
}
}
function calculateXAxisSize(){
var longestText = 1;
//if we are showing the labels
if (config.scaleShowLabels){
ctx.font = config.scaleFontStyle + " " + config.scaleFontSize+"px " + config.scaleFontFamily;
for (var i=0; i<calculatedScale.labels.length; i++){
var measuredText = ctx.measureText(calculatedScale.labels[i]).width;
longestText = (measuredText > longestText)? measuredText : longestText;
}
//Add a little extra padding from the y axis
longestText +=10;
}
xAxisLength = width - longestText - widestXLabel;
valueHop = Math.floor(xAxisLength/(data.labels.length-1));
yAxisPosX = width-widestXLabel/2-xAxisLength;
xAxisPosY = scaleHeight + config.scaleFontSize/2;
}
function calculateDrawingSizes(){
maxSize = height;
//Need to check the X axis first - measure the length of each text metric, and figure out if we need to rotate by 45 degrees.
ctx.font = config.scaleFontStyle + " " + config.scaleFontSize+"px " + config.scaleFontFamily;
widestXLabel = 1;
for (var i=0; i<data.labels.length; i++){
var textLength = ctx.measureText(data.labels[i]).width;
//If the text length is longer - make that equal to longest text!
widestXLabel = (textLength > widestXLabel)? textLength : widestXLabel;
}
if (width/data.labels.length < widestXLabel){
rotateLabels = 45;
if (width/data.labels.length < Math.cos(rotateLabels) * widestXLabel){
rotateLabels = 90;
maxSize -= widestXLabel;
}
else{
maxSize -= Math.sin(rotateLabels) * widestXLabel;
}
}
else{
maxSize -= config.scaleFontSize;
}
//Add a little padding between the x line and the text
maxSize -= 5;
labelHeight = config.scaleFontSize;
maxSize -= labelHeight;
//Set 5 pixels greater than the font size to allow for a little padding from the X axis.